Filling vent structure for storage batteries



July 19, 1932. B. FORD I FILLING VENT STRUCTURE! FOR STORAGE BATTERIES Filed March 29. 1926 PHN) ` Afro/Mik FILLING-,VENT STBUC'UBE FDE STOBAQE BATTE :l`

Application med Haren as, 192s." serial m'. 98,316.

rl`he principal object of the invention` will appearfrom the following description at the end of which the invention will be claimed. y

In the following description reference will be made to the accompanying drawing formj ing part hereof and in which Figure 1 is a central sectional view of a filling vent structure embodying features of the invention.

Fig. 2 is a similar view illustrating a modlcation, and

Figs. 3 and 4 are similar views illust-rating other modifications.

In the drawing and referring more particularly to Fig. 1, 1 isa horizontal cover.

-There is a tubular structure extending through and above and below the cover 1,

and the top part 2 is stoppered and the bottom part-3 is'arranged-to dip below the elecderstood to require illustration or further description." There is a gas entrance 4 from below the cover and a gas outlet 5 from the top part 2. The interlor of said structure provides an expansion chamber.

Gas, spray, vapor or the like above the acid level and below the cover, that is in the space' at the top of the cell, entering through the gas inlet or entrance 21 expands in the expansion chamber and the gas escapes to the atmosphere through the gas outlet 5 and the liquid falls back into the electrolyte through the lower open end of the part 3.

The construction and mode of operation of the modification shown in Fig. 2 are as above described except that the gas outlet 7 is tortuous and is provided by a notch in the top of the bounding wall of the part 2.

'She construction and mode of operation of 4 the modification shown in Fig. 3 are as above described except that the gas outlet 8 is arranged through the plug or stopper 9.

The construction and mode of operation of the modification shown in Fig. 4 are as above described except that -the inlets or gas entrances 10 and the gas outlets 11 are provided by elongated notches or grooves in the bounding wall of the part 2, or more accurately, an enlargements 'of' that wall, and by provi ,ing space between the top of the Dart trolyte level, not shown because too well un- 2 and the underface of the plg or stopper v12.

The interior wall may be offset as shown at 13 as a convenient indicator of the normal level of the electrolyte when lilling the cell. In such casethebottom edge of the bottom 55 part 3 serves as a warning indication that the cell is approaching the proper level for the electrolyte and the shoulder edge 1,3 serves as an indicator for the normal level of the electrolyte. l v It will be obvious to those skilled in the art to which the invention relates that modications may be made in details of construction and arrangement and matters of mere form without departing from the spirit of the in- N vention which is not limited to such matters or otherwise than the prior art and the appended .claim may require.

A filling vent structure -for storage battery cells containing aliquid electrolyte, said vent structure comprising a normally horizontal cover havingan integral, unitary, tubular structure extending above and below said cover and having upper and lower openings therein, the lower portion of the tubular structure having its interior wall offset to form a bottom chamber of larger diameter, the relative diameters of the tubular structureV andof the bottom chamber and the height of 80 the tubular structure and of the bottom chamber being so proportioned that a straight line connecting the lower inner edge of the bottom chamber and the lower inner edge of the tubular structure at the top of the offset passes through the upper opening of the tubular structure so that the lowei edge of the bottom chamber is visible from the exterior of vthe tubular structure, the lower inner edge of the tubular structure at the top of the offset being at substantially the normal level of the electrolyte, so that the lower inner edge -of the tubular structure at the top of the o set provides an indicator of the normal level of the electrolyte when filling the cell and 95 l the lower edge of the tubular structure provides a warning level of the electrolyte. BRUCE FORD. 

